MRP-Dependenat req deletion -reg

Suppose a finished product is put PIRs through MD61 and run MRP , dependent requirements are generated for the BOM child parts of the finished product .
Latter when I do planning for the same finished product subsequently for the next time periods ,through MD61 , ,,,,what is happening is though I am deleting the existing planned orders of the finished product , dependent requirements of the child parts are still remaining ,not getting deleted automatically , because of which system is considering these dependent req as demand and generating procurement proposals for these old dep req quantities also .
How to avoid these ?
How to delete the existing , unused PIRs ?through MD75/76??
How to delete the existing ,unserviced planned orders ?through MD16?
Most importantly how to delete the dependent requirements of the child parts ? or how to set the system not to consider these old /existing dep requirements for generating procurement proposals during MRP run ?
Please provide necessary inputs
Madhu Kiran
SAP-PP

hi ,
i have tried like that only
i have deleted PIRs through MD62 and then run MRP for the finished product using planning mode 3
i ahve run MRP through MD02 for the finished product , with display results before save option and when MRP is run , first for finished part MRP results showing nothing , next save then when it is going to Child parts it is showing the old DEP req also ..... for example which is of 2001 year also being shown
any setting to be done for MRP ??????
procedure through screen shot would highly appreaciated
thanks
madhu kiran

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Please can one of you say guide me how can i control the deletion and recreation of the Purchase Requisitions during the MRP Run. I know its standard in SAP , but not sure where to control this setting.
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MRP-Dependenat req deletion -reg

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